Not sure here on how often it happens but I do know cases of child who had lived their entire life trapped in a bubble cause home tutoring and over protective parents, so...
Also the scar backstory came as a lot more light hearted than what I was expecting, ngl. And regarding the scar growing with her, yeah that's a nono so it's either artistic freedom or the actual wound was just that huge, which is scary cause it can actually be the case.
Anyway, cute backstory with cute character interactions, thanks a lot for this update!